Workers' Compensation And Pneumoconiosis (Tables)

6 Months Ended

Jun. 30, 2011

Workers Compensation And Pneumoconiosis

Workers' Compensation Liability

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011			2010
Beginning balance	$	70,965		$	66,371		$	67,687		$	63,220
Accruals increase		5,557			5,005			11,114			9,811
Payments		(2,801	)		(2,293	)		(6,028	)		(4,818	)
Interest accretion		794			833			1,587			1,666
Valuation loss		—			134			155			171
Ending balance	$	74,515		$	70,050		$	74,515		$	70,050